I had the same code for my 2004 chevy cavalier and it turned out to be the evap solenoid behind the passenger side rear tire. It has a small wiring harness coming out of it and a rubber hose connected to it. It just pops out of the frame of the car after unplugging said wire and hose. But you can only get another one by finding a junkyard that has one or going to a dealership.
It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
1) Check to make sure your fuel cap is tight.
2) Visually inspect all hoses and lines from the engine to the fuel tank including the fill neck hoses.
Replace any that are worn out or broken.
Once you have fixed the problem the service engine light will go out after 3 cold starts that do not leak vapor.
Good luck and let me know what you find or don't find and we can go from there.
Regards,
Just bougt a 04 cavalier. check engine is coming on. the code is po455 how do i know if my gas cap is the right one or defective?
I had the same problem as t_scott_bac. The EVAP solenoid was stuck open. Replaced it and reset the engine light with a generic OBD II code reader, problem solved.
SOURCE: Received P0455 Evap System Large Leak Detected - 2004 Cavalier
your problem is probably a vacuum hose that goes from the purge valve to the gas tank (crack or broken hose). There should be two of these check both. A broken vacuum line will make the purge valve make a clicking noise that can be mistaken for noisy engine valves.
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